EP2277343B1 - Procédé et dispositif de resélection de cellules inter-fréquence ou inter-rat - Google Patents

Procédé et dispositif de resélection de cellules inter-fréquence ou inter-rat Download PDF

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Publication number
EP2277343B1
EP2277343B1 EP09738279.0A EP09738279A EP2277343B1 EP 2277343 B1 EP2277343 B1 EP 2277343B1 EP 09738279 A EP09738279 A EP 09738279A EP 2277343 B1 EP2277343 B1 EP 2277343B1
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Prior art keywords
target cell
cell
available target
priority layer
current serving
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EP09738279.0A
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German (de)
English (en)
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EP2277343A1 (fr
EP2277343A4 (fr
Inventor
Christopher Callender
Harri Jokinen
Leonardo Provvedi
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Nokia Technologies Oy
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Nokia Technologies Oy
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/18—Selecting a network or a communication service
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/16—Discovering, processing access restriction or access information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/20—Selecting an access point

Definitions

  • This invention relates to wireless communication.
  • the present invention relates to the cell selection for a wireless device for communication in a wireless network.
  • wireless communication different wireless systems are available to provide different types of services and capabilities.
  • wireless communication systems include wireless local area networks and cellular networks, among others.
  • the cellular networks may include a variety of network types, such as Universal Terrestrial Radio Access Network (UTRAN), GSM/EDGE Radio Access Network (GERAN).
  • UTRAN Universal Terrestrial Radio Access Network
  • GERAN GSM/EDGE Radio Access Network
  • Cellular networks typically include multiple cells which allow a mobile user device to communicate while moving through the network.
  • a user device may be located in a geographic region serviced by multiple networks.
  • the multiple networks may be arranged by their respective operators to be inter-operative.
  • one network operator may have an arrangement with another network operator to allow its users to switch to the other network if required avoid a disconnection from the network.
  • inter-frequency and inter-RAT radio access technology
  • cell reselection is performed according to agreed-upon priority algorithms.
  • E-UTRA Evolved Universal Terrestrial Radio Access
  • NOKIA ET AL "Performance Requirements and Text Proposal for Idle reselection in 36.133", 3GPP DRAFT; R4-080772, 3GPP, MOBILE COMPETENCE CENTRE; 650, ROUTE DES LUCIOLES; F-06921 SOPHIA-ANTIPOLIS CEDEX; FRANCE, vol. RAN WG4, no. Shenzhen, China; 28 March 2008 , discusses on performance requirements and text proposal for idle reselection in 3GPP TS 36.133 and considers how to further progress the work by defining suitable values for such parameters such as cell identification and measurement rates.
  • the current cell reselection methods have shortcomings which are addressed and improved by embodiments of the present invention.
  • the phrase "priority layer” is used in a generic way to indicate either a RAT, or a frequency layer of RAT, or a group of frequencies of a RAT (e.g. a particular band).
  • the invention relates to a method for inter-frequency or inter-RAT reselection of a cell in a wireless network as defined in claim 1.
  • a user device apparatus as defined in claim 6 is provided.
  • a computer program product as defined by claim 11.
  • the cell reselection algorithm for E-UTRA is defined in the current specification (3GPP TS 36.304, version 8.1.0), which is available at www.3gpp.org/ftp/Specs/html-info/36304.htm.
  • a user device camped on a cell regularly searches for a better cell according to the defined cell reselection criteria. If a better cell is found, that cell is reselected.
  • the various cells available to the user device are assigned priorities.
  • the above-noted specification provides that "[a]bsolute priorities of different inter-RAT frequencies or E-UTRAN inter-frequencies may be provided to the UE in the system information and optionally in the RRC message releasing RRC connection by the RPLMN.” If priorities are assigned through dedicated signaling, the user device ignores the priorities provided in the system information (i.e. broadcast signalling).
  • Srxlev Q rxlevmeas ⁇ Qrxlevmin ⁇ Pcompensation
  • the selection criteria must be greater than 0, or Srxlev > 0.
  • each cell is assigned a low threshold 214, a high threshold 212 and a suitability threshold 216.
  • the user device reselects another cell on a higher priority layer if the level in the other cell is higher than the high threshold defined for that cell.
  • the actual level of the serving cell is not taken into consideration.
  • the user device selects a cell with a lower priority layer if this other cell is above the low threshold.
  • the high threshold is used for accepting reselection to a lower priority layer.
  • the use of the higher threshold guarantees that reselection is not triggered unless service at the target frequency or RAT is good enough to avoid an immediate reselection back.
  • a hysteresis mechanism is introduced in the cell reselection process to avoid the ping-pong behavior described above.
  • the serving cell falls below the lower threshold and no other cell in another priority layer exists above the high threshold (i.e., neither lower priority nor higher priority exists above the high)
  • another mechanism to provide hysteresis could be introduced.
  • the user device does not reselect another RAT if it has insufficient margin to the point where reselection is triggered, that is relative to the low threshold.
  • the user device when the serving RAT level drops below the serving RAT low threshold, if no better other RAT is available according to the priority based reselection rules, the user device is allowed to reselect another RAT if the level of that RAT, relative to the low threshold (or relative to the high threshold) defined for that RAT exceeds the level of the serving RAT, relative to the low threshold (or the high threshold) defined for the serving RAT, by a specific hysteresis.
  • the specific hysteresis may be either fixed or defined by a network controlled parameter.
  • the user device is able to avoid approaching levels where service may be lost even if suitability is fulfilled by providing hysteresis between different cells. It will be appreciated by those skilled in the art that, while the discussion herein at times refers to a level relative to the low threshold of a cell, embodiments using a level relative to the high threshold are also contemplated within the scope of the present invention.
  • cell reselection is performed if the selection criteria of the target cell of a higher priority layer is greater than the high threshold during a predefined time period.
  • the user device considers the available cells for reselection in a decreasing order of priority and, for cells of the same priority layer, in decreasing order of selection criteria.
  • cell reselection is performed if the level of the serving cell falls below the low threshold, and all available cells at the serving frequency are below the low threshold; in this case, the user device considers the inter-RAT and inter-frequency cells for reselection in a specific order.
  • the reselection is based on the first such cell that satisfies the following criteria:
  • the difference could be taken from the high threshold.
  • a reselection is triggered when ⁇ ( serving ) for the serving cell becomes negative, as illustrated by the condition of the serving cell in Figure 3 , where the level of the serving cell has fallen below the low threshold.
  • the user device reselects a priority layer only if its level, relative to the low threshold (or, in other embodiments, the high threshold), defined for that layer exceeds the level of the serving RAT, relative to the low threshold (or the high threshold) defined for the serving RAT, by a specific hysteresis, which may be either fixed or defined by a network controlled parameter.
  • the user device reselects a priority layer i only if ( ⁇ ( i ) - ⁇ ( serving ) ) > H, where H is the hysteresis.
  • the user device reselects priority layer 1, regardless of the absolute priority of each layer.
  • the hysteresis H is not shown in Figure 3 .
  • the user device can reselect the priority layer with the highest priority. In other embodiments, the user device could reselect the priority layer for which the level is highest.
  • the UE could consider the priority layers that meet the S criteria and either reselect the one with the highest priority or perform relative ranking among them and reselect to the strongest one (i.e. the one with the highest value of Srxlev).
  • FIGS. 4A and 4B exemplary cell reselection methods according to embodiments of the present invention are illustrated.
  • the user device reselects priority layer 3, which is the only one assumed to be above the high threshold.
  • the user device chooses the priority layer with the highest absolute priority among those that are above the high threshold.
  • a cell reselection process according to an embodiment of the present invention is illustrated.
  • a user device conducts regular searches for available cells (block 810).
  • the user device determines whether any cells at a higher priority layer are available (block 812). If such a cell is available, the process proceeds to block 814 and determines whether any of the available cells are above the high threshold. If an available cell is above the high threshold, the process proceeds to block 816 and selects that cell, and the process returns to block 810 and conducts its next regular search.
  • the process proceeds to block 818 and determines whether the serving cell is below its low threshold. If the cell is not below its low threshold, the device camps at the serving cell (block 826). On the other hand, if the serving cell is below its low threshold, the device determines whether any cell at a lower or same priority layer is available (block 820). If no cell is available, the device proceeds to block 824. Otherwise, it determines whether the available cell is above its high threshold (block 822). If any available cell is above its high threshold, that cell is selected (block 816). Otherwise, the device proceeds to block 824 and determines whether any cell is available with a level above the hysteresis level better than the serving cell (block 824).
  • the device If no such cell is available, the device camps at the serving cell 826. If any cell is available with a level above the hysteresis level better than the serving cell, that cell is selected (block 816).
  • embodiments of the present invention provide solutions to the shortcomings of current cell selection or reselection methods.
  • Figure 5 shows a system 10 in which various embodiments of the present invention can be utilized, comprising multiple communication devices that can communicate through one or more networks.
  • the system 10 may comprise any combination of wired or wireless networks including, but not limited to, a mobile telephone network, a wireless Local Area Network (LAN), a Bluetooth personal area network, an Ethernet LAN, a token ring LAN, a wide area network, the Internet, etc.
  • the system 10 may include both wired and wireless communication devices.
  • the system 10 shown in Figure 5 includes a mobile telephone network 11 and the Internet 28.
  • Connectivity to the Internet 28 may include, but is not limited to, long range wireless connections, short range wireless connections, and various wired connections including, but not limited to, telephone lines, cable lines, power lines, and the like.
  • the exemplary communication devices of the system 10 may include, but are not limited to, an electronic device 12 in the form of a mobile telephone, a combination personal digital assistant (PDA) and mobile telephone 14, a PDA 16, an integrated messaging device (IMD) 18, a desktop computer 20, a notebook computer 22, etc.
  • the communication devices may be stationary or mobile as when carried by an individual who is moving.
  • the communication devices may also be located in a mode of transportation including, but not limited to, an automobile, a truck, a taxi, a bus, a train, a boat, an airplane, a bicycle, a motorcycle, etc.
  • Some or all of the communication devices may send and receive calls and messages and communicate with service providers through a wireless connection 25 to a base station 24.
  • the base station 24 may be connected to a network server 26 that allows communication between the mobile telephone network 11 and the Internet 28.
  • the system 10 may include additional communication devices and communication devices of different types.
  • the communication devices may communicate using various transmission technologies including, but not limited to, Code Division Multiple Access (CDMA), Global System for Mobile Communications (GSM), Universal Mobile Telecommunications System (UMTS), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Transmission Control Protocol/Internet Protocol (TCP/IP), Short Messaging Service (SMS), Multimedia Messaging Service (MMS), e-mail, Instant Messaging Service (IMS), Bluetooth, IEEE 802.11, etc.
  • CDMA Code Division Multiple Access
  • GSM Global System for Mobile Communications
  • UMTS Universal Mobile Telecommunications System
  • TDMA Time Division Multiple Access
  • FDMA Frequency Division Multiple Access
  • TCP/IP Transmission Control Protocol/Internet Protocol
  • SMS Short Messaging Service
  • MMS Multimedia Messaging Service
  • e-mail e-mail
  • Bluetooth IEEE 802.11, etc.
  • a communication device involved in implementing various embodiments of the present invention may communicate using various media including, but not limited to, radio, infrared, laser, cable connection, and the like.
  • FIGS 6 and 7 show one representative electronic device 28 which may be used as a network node in accordance to the various embodiments of the present invention. It should be understood, however, that the scope of the present invention is not intended to be limited to one particular type of device.
  • the electronic device 28 of Figures 6 and 7 includes a housing 30, a display 32 in the form of a liquid crystal display, a keypad 34, a microphone 36, an ear-piece 38, a battery 40, an infrared port 42, an antenna 44, a smart card 46 in the form of a UICC according to one embodiment, a card reader 48, radio interface circuitry 52, codec circuitry 54, a controller 56 and a memory 58.
  • the above described components enable the electronic device 28 to send/receive various messages to/from other devices that may reside on a network in accordance with the various embodiments of the present invention.
  • Individual circuits and elements are all of a type well known in the art, for example in the Nokia range of mobile telephones.
  • a computer-readable medium may include removable and non-removable storage devices including, but not limited to, Read Only Memory (ROM), Random Access Memory (RAM), compact discs (CDs), digital versatile discs (DVD), etc.
  • program modules may include routines, programs, objects, components, data structures, etc. that perform particular tasks or implement particular abstract data types.
  • Computer-executable instructions, associated data structures, and program modules represent examples of program code for executing steps of the methods disclosed herein. The particular sequence of such executable instructions or associated data structures represents examples of corresponding acts for implementing the functions described in such steps or processes.
  • Embodiments of the present invention may be implemented in software, hardware, application logic or a combination of software, hardware and application logic.
  • the software, application logic and/or hardware may reside, for example, on a chipset, a mobile device, a desktop, a laptop or a server.
  • Software and web implementations of various embodiments can be accomplished with standard programming techniques with rule-based logic and other logic to accomplish various database searching steps or processes, correlation steps or processes, comparison steps or processes and decision steps or processes.
  • Various embodiments may also be fully or partially implemented within network elements or modules. It should be noted that the words "component” and “module,” as used herein and in the following claims, is intended to encompass implementations using one or more lines of software code, and/or hardware implementations, and/or equipment for receiving manual inputs.

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  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Claims (11)

  1. Procédé de resélection inter-fréquence ou inter-RAT d'une cellule dans un réseau sans fil par un dispositif utilisateur, le procédé comprenant les étapes suivantes :
    a) détecter (818) qu'un niveau de signal d'une cellule de desserte courante est inférieur à un seuil défini pour la cellule de desserte courante ;
    b) déterminer (820) la disponibilité d'au moins une cellule cible au niveau d'une couche prioritaire inférieure ou égale à la cellule de desserte courante ; et
    c) déterminer (822), pour l'au moins une cellule cible disponible au niveau d'une couche prioritaire inférieure ou égale à la cellule de desserte courante, si la cellule cible disponible a un niveau de signal supérieur à un seuil défini pour la cellule cible disponible ;
    d) sélectionner (816) une cellule cible disponible parmi l'au moins une cellule cible disponible pour laquelle la détermination en c) est affirmative,
    et, lorsque la détermination en c) est négative, alors
    e) déterminer la disponibilité d'au moins une cellule cible au niveau de n'importe quelle couche prioritaire ;
    f) déterminer (824), pour l'au moins une cellule cible disponible au niveau de n'importe quelle couche prioritaire, si la cellule cible disponible a un niveau de signal supérieur d'une hystérésis au niveau de signal de la cellule de desserte courante ; et
    g) sélectionner (816) une cellule cible disponible parmi l'au moins une cellule cible disponible au niveau de n'importe quelle couche prioritaire pour laquelle la détermination en f) est affirmative.
  2. Procédé selon la revendication 1, dans lequel c) utilise une hystérésis pour effectuer la détermination.
  3. Procédé selon la revendication 1, dans lequel les étapes suivantes sont exécutées avant a) :
    déterminer la disponibilité d'au moins une cellule cible au niveau d'une couche prioritaire plus élevée que la cellule de desserte courante ;
    déterminer, pour l'au moins une cellule cible disponible au niveau d'une couche prioritaire plus élevée que la cellule de desserte courante, si la cellule cible disponible a un niveau de signal supérieur à un seuil défini pour la cellule cible disponible ; et
    sélectionner une cellule cible disponible parmi l'au moins une cellule cible disponible au niveau d'une couche prioritaire plus élevée que la cellule de desserte courante si la cellule cible disponible a un niveau de signal supérieur audit seuil pour la cellule cible disponible.
  4. Procédé selon la revendication 1, dans lequel le niveau de signal est la valeur de puissance mesurée du signal reçu.
  5. Procédé selon la revendication 4, dans lequel la valeur de puissance mesurée du signal reçu est ajustée par au moins une valeur de décalage.
  6. Appareil de dispositif utilisateur (28) pour la resélection inter-fréquence ou inter-RAT d'une cellule dans un réseau sans fil, l'appareil comprenant :
    un processeur (56) ; et
    une unité de mémoire (58) connectée au processeur (56) de manière communicative et comportant un code informatique pour :
    a) détecter qu'un niveau de signal d'une cellule de desserte courante est inférieur à un seuil défini pour la cellule de desserte courante ;
    b) déterminer la disponibilité d'au moins une cellule cible au niveau d'une couche prioritaire inférieure ou égale à la cellule de desserte courante ; et
    c) déterminer, pour l'au moins une cellule cible disponible au niveau d'une couche prioritaire inférieure ou égale à la cellule de desserte courante, si la cellule cible disponible a un niveau de signal supérieur à un seuil défini pour la cellule cible disponible ;
    d) sélectionner une cellule cible disponible parmi l'au moins une cellule cible disponible pour laquelle la détermination en c) est affirmative, et
    lorsque la détermination en c) est négative, alors
    e) déterminer la disponibilité d'au moins une cellule cible au niveau de n'importe quelle couche prioritaire ;
    f) déterminer, pour l'au moins une cellule cible disponible au niveau de n'importe quelle couche prioritaire, si la cellule cible disponible a un niveau de signal supérieur d'une hystérésis au niveau de signal de la cellule de desserte courante ; et
    g) sélectionner une cellule cible disponible parmi l'au moins une cellule cible disponible au niveau de n'importe quelle couche prioritaire pour laquelle la détermination en f) est affirmative.
  7. Appareil (28) selon la revendication 6, dans lequel le code informatique de c) utilise une hystérésis pour effectuer la détermination.
  8. Appareil (28) selon la revendication 6, dans lequel l'unité de mémoire (58) inclut un code informatique pour exécuter les étapes suivantes avant l'exécution du code informatique de a) :
    déterminer la disponibilité d'au moins une cellule cible au niveau d'une couche prioritaire plus élevée que la cellule de desserte courante ;
    déterminer, pour l'au moins une cellule cible disponible au niveau d'une couche prioritaire plus élevée que la cellule de desserte courante, si la cellule cible disponible a un niveau de signal supérieur à un seuil défini pour la cellule cible disponible ; et
    sélectionner une cellule cible disponible parmi l'au moins une cellule cible disponible au niveau d'une couche prioritaire plus élevée que la cellule de desserte courante si la cellule cible disponible a un niveau de signal supérieur audit seuil défini pour la cellule cible disponible.
  9. Appareil (28) selon la revendication 6, dans lequel le niveau de signal est la valeur de puissance mesurée du signal reçu.
  10. Appareil (28) selon la revendication 9, dans lequel la valeur de puissance mesurée du signal reçu est ajustée par au moins une valeur de décalage.
  11. Produit programme informatique comprenant un support lisible par ordinateur sur lequel est intégré un code de programme informatique destiné à être utilisé avec un ordinateur, le code de programme informatique étant configuré pour exécuter les étapes du procédé tel que revendiqué dans l'une quelconque des revendications 1 à 5, lorsqu'il est exécuté sur l'ordinateur.
EP09738279.0A 2008-04-28 2009-04-28 Procédé et dispositif de resélection de cellules inter-fréquence ou inter-rat Active EP2277343B1 (fr)

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US4852408P 2008-04-28 2008-04-28
PCT/FI2009/050336 WO2009133242A1 (fr) 2008-04-28 2009-04-28 Procédé et système de resélection de cellules interfréquences ou inter-rat

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EP2277343A1 EP2277343A1 (fr) 2011-01-26
EP2277343A4 EP2277343A4 (fr) 2016-11-02
EP2277343B1 true EP2277343B1 (fr) 2018-01-24

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US (1) US10117164B2 (fr)
EP (1) EP2277343B1 (fr)
CN (1) CN102084688B (fr)
ES (1) ES2665455T3 (fr)
MX (1) MX2010011584A (fr)
RU (1) RU2477932C2 (fr)
WO (1) WO2009133242A1 (fr)

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US10117164B2 (en) 2018-10-30
US20100081438A1 (en) 2010-04-01
EP2277343A1 (fr) 2011-01-26
ES2665455T3 (es) 2018-04-25
RU2010148319A (ru) 2012-06-10
RU2477932C2 (ru) 2013-03-20
WO2009133242A1 (fr) 2009-11-05
CN102084688B (zh) 2014-05-14
EP2277343A4 (fr) 2016-11-02
MX2010011584A (es) 2011-01-20
CN102084688A (zh) 2011-06-01
AU2009241985A1 (en) 2009-11-05

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